Door operating mechanism for dump cars



Oct. 7, 1947.

J. J. KORDISH EFAL DOOR OPERATING MECHANISM FOR DUI? CARS 3 Sheets-sheaf 1 Filed Nov. 9, 1943 IN'VENTORSZ I Joy/v J flea/5mm Ail/$250774,

BY. A 6? THEIR ORNEY 1 1947- J. J. KORDISH ETAL 2,428,629

DOOR OPERATING IBCHANISI FOR DUIP'CARS Filed Nov. 9, 1943 3 Sheets-Sheet 2 INVENTORS I DOOR OPERATING MECHAKISM FOR DUI? CARS Filed Nov. 9, 1943 3 Sheets-Sheet 3 I if C imenlrsi' If 15/ JUH/V J {OED/5H4! /5 M/KE 7;? rm,

Patented Oct. 7.1947

UNITED noon OPERATING MECHANISM non DUMP cans John J. Kordish and Mike Trotta, Hibblng, Minn.,

assignors to Oliver Iron Mining Company, a corporation of Minnesota Application November 9, 943, Serial Nb. 509,598

This invention relates to a door operating mechanism for dump cars, especially for dump cars which are used to carry iron ore. The ore is dumped from the car by raising one side of the body from the frame. Under normal conditions the door, which extends the length of the body, opens by gravity as the body is tilted. However, the cars are often used in freezing weather, and the car doors become frozen and refuse to open-when the body is tilted. In many instances the entire car with its load is turned over due to the failure of the door to open.

It is an object of this invention'to provide mechanism for positively opening the door at the beginning of the dumping cycle.

This and other objects will be more apparent after referring to the iollowing description and attached drawings in which: I

Figure l is aside elevation of the dump car;

Figure 2 is a sectional view on the line 11-11 of Figure 1;

Figure 3 is a sectional view on the line IIIIII of Figure 1;

Figure 4 is a sectional view on the line IV IV' of Figure 1;

Figure 5 is a view similar.to Figure 4 showing the relative position of the underframe, body,

, door and door actuating mechanism and axis of tilt at the instant that parts 20 and 28 come into contact; I

Figure 6 is a view similar to Figure 5 but showing the door in the full open position and the car body in the full dump position; and

Figure l is a view similar to Figure 6 but showing the door partially closed when the body is in 'the full dump position.

Referring more particularly to the drawings the reference numeral 2 indicates thebody of a dump car, the body being mounted on the frame l. Extending the length of each side of the body 6 Claims. (Cl. 105--276) body is supported as it is raised from the frame. A semi-circular portion 28 adjacent the portion 26 supports the body during the latterpart of its upward movement.

In operation air is supplied to the ,bottom of the cylinders ill on one side of the car. This raises that side of the body while the other side is sup-, ported by the portions 26 and 28 of the bearings 22. During the latter part of this tilting movement thebearlng portion 28 rests in the portion 20 of the support I6 and the entire body rotates about the center of these semi-circular portions. As the body rises the door 6 normally drops due to gravity to the dotted line position shown in Figures 2 and 4. I

Separate linkage 30 located at the ends of the car holds the door opposite the dumping side in the closed position and also controls the speed of opening of the door during the complete dumping and righting cycle if the door is free to open by gravity.- The linkage 30 is inoperative on the low or dumping side of the car body. This linkage is standard equipment for these cars and therefore is not shown in detail. If the car dumps to one side only, linkage 3|] is omitted.

The positive door opening mechanism which constitutes the invention in the present application is best shown in Figure 4. The mechanism on each side of the center line of the car is identical and therefore the description will be limited 'to the mechanism on the right hand side of the center line as shown in Figure 4. A bracket 32 is welded to the under part of the car sills 34 for a, purpose which will appear below. A bracket 36 is attached to the body 2 and carries a pin 38 on which is mounted a three armed lever 40. One arm 42 pivotally carries one end of link M and the other end is pivotally con- 2 is a door 6 which is pivotally mounted on the pins 8. The body may be tilted to either side by means of a pair of air cylinders l0 which are pivotally mounted on each side of the frame 4. The piston rod l2 of each cylinder I0 is attached to the body 2 by means of a pin l4. Mounted on each side of the body are a plurality of brackets l6 for supporting the body 2. The top of each of the brackets l6 has a flat portion l8 and a semi-circular portion 20. The body 2 has a plurality of bearing members 22 attached thereto for cooperating with the corresponding supports l6. Each of the bearings 22 has a flat portion 24 on which the body of the car is normally supported anda curved portion '26 on which the car nected to the door 6 at 46, the center line of this link when extended being above the center line of pin 38. The upper arm 48 of the lever carries a roller 50 which is normally in contact with the top of sill an The lower arm 52 of the lever carries a roller 54 which normally bears against the vertical edge of bracket 32.

The operation of the device is as follows:

When operating normally the new improved linkage operates the same as the original standard linkage; that is, the door opens due to gravity. During this movement the lever 40 turns in a counterclockwise direction about its pin 38. If the door refuses to open for any reason when the body is tilted, the entire linkage rotates or tends to rotate in a clockwise direction with the car body and forces the lower roller 54 against the end of bracket 32. The reaction of bracket 32 against the roller 56 forces the lever 40 to turn in a counterclockwise direction, this producing a pull on the link 46 and forcing the door 6 open. After the car has been partially dumped and the door forced open, the lowerroller 5t clears the bracket 32 as shown in Figures 6 and 7 and the door becomes full floating. In other words, the door 6 may close with respect to the body if it hits the ground or a pile of ore as shown in Figure '7 or it may continue to open until it assumes the position shown in Figure 6. Thus, the term full floating means that the door 6 can move or be moved in either direction with respect to the body 2. Upon returning the car to its normal position the roller 50 is forced against the top of the car sill to producing a clockwise rotation of lever 40, this forcing the I door to close. The linkage is so designed that the 1. A dump car comprisinga frame, a movable body mounted on said frame, means for tilting said body with respect to said frame to discharge .its load, a door mounted for pivotal movement parallel to the axis of body tilt on the discharge side of said body, said door tending to open by gravity when the body is tilted, a three-armed level pivotally mounted on said body, and a link connecting one arm of said lever and the door, another arm of said lever being forced against said frame should the door refuse to open by gravity as the body begins to tilt wherebythe lever is rotated to force the door open, said last named arm clearing said frame upon continued tilting of said body so that the door becomes full floating after it is forced open, the third arm engaging the top of the frame when the body returns to normal position to cause and maintain closure of said door.

2. A dump car comprising a frame, a movable body mounted on said frame, means for tilting said body with respect to said frame to discharge its load, a door mounted for pivotal movement parallel to the axis of body tilt on the discharge side of said body, said door tending to open by gravity when the body is tilted, a three-armed lever pivotally mounted on said body, and link connecting one arm of said lever and the door, the extension of the center line of said link being above the pivot of said lever, another arm of said lever being forced against said frame should the door refuse to open by gravity as the body begins to tilt whereby the lever is rotated to force the door open, said last named arm clearing said frame upon continued tilting of said body so that the door becomes full floating after it is forced open, the third arm engaging the top of the frame when the body returns to normal position to cause and maintain closure of said door.

3. A dump car comprising a frame, a movable body mounted on said frame, means for tilting said body with respect to said frame to discharge its load, a door mounted for pivotal movement parallel to the axis of body tilt on the discharge side of said body, said door tending to open by gravity when the body is tilted, a pin connected to said body, a three-armed lever mounted on said pin, a roller mounted on one arm of said lever below said pin and adapted to contact said frame, a link connected to another arm of said lever and to the door at a point below its pivot, said roller being forced against said frame should the door refuse to open by gravity as the body begins to tilt whereby the lever is rotated to force the door open, said roller clearing said frame upon continued tilting of said body so that the door becomes full floating after it is forced open, the third arm engaging the top of the frame when the body returns to normal position to cause and maintain closure of said door.

4. Adump car comprising a frame, a movable body mounted on said frame, means for tiltin said body to discharge its load, a door pivotally mounted on the discharge side of said body, said door normally opening by gravity when the body is tilted, a pin connected to said body, a three armed lever mounted on said pin ,"a roller mounted the center line of said pin, said first roller being forced against said frame when the door refuses t .open by gravity as the body is tilted whereby the lever is rotated to force the door open, said second roller being forced against said frame when the body is lowered to rotate said lever in the direction opposite the first rotation to close said door when the body returns to normal position.

5. A dump car comprising an underframe, a movable body mounted on said frame, means for tilting said body with respect to said frame to discharge its load, a door mounted for pivotal movement parallel to the axis of body tilt on the discharge side of said body, said door tending to open by gravity when the body is tilted, a three-armed lever pivotally mounted on said body, a link pivotally connecting one arm of said lever to the door, an abutment on said frame, means connected to another arm of said lever and bearing on said abutment to rotate said lever and force the door open should it fail to open by gravity as the body begins to tilt, said means leaving said abutment updn continued tilting of said body so thatthe door becomes full floating-after it is forced open the third arm engaging the top of the frame when the body returns to normal position to cause and maintain closure of said door.

6. A dump car comprising an underframe, a

movable body mounted on said frame, means for tilting said body with respect to said frame to discharge its load, a door mounted for pivotal movement parallel to the axis of body tilt on the discharge side of said body, said door' tending to open by gravity when the body is tilted, a threearmed lever pivotally mounted on said body, a link pivotally connecting one arm of said lever to the door, an abutment on said frame, means connected to another arm of said lever and bearing on said abutment to rotate said lever and force, the door open should it fail to open by gravity as the body begins to tilt, said means leaving said abutment upon bontinued tilting of said body so that the door becomes full floating after it is forced open, a roller mounted on the third arm of said lever above its pivot, said roller being forced against said frame when the body 5 6 opposite the first rotation to close said door UNITED TENTS when the body returns to normal position. STATES PA JOHN J. KORDISH. Number Name Date I Mmm'mm'm. 2,181,629 Slaker Nov. 2a, 1939 5 1,611,012 Flowers Dec. 14, 1936 nnmnmcns crmn The following references are of record in th file of this patent: 

